When you ask "What number is halfway between 4 and 391?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=391.
To find the number halfway between 4 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 391 into our formula, we get:
(4 + 391)/2 = 197.5
Thus, the number halfway between 4 and 391 is 197.5.
To check that our answer is correct, we subtract 4 from 197.5 and subtract 197.5 from 391 and compare the two numbers:
197.5 - 4 = 193.5
391 - 197.5 = 193.5
As you can see, the halfway number is 193.5 higher than 4 and 193.5 lower than 391. Therefore, our halfway between answer of 197.5 above is correct.
Halfway Between
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Halfway Between 4 and 392
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